Added missing public_ip_addresses property to api_management

[vidarw]

Adds the missing property fields of public_ip_addresses to the terraform api_management resource and data source.

Example code that demonstrates the fixed problem:

provider "azurerm" {}

resource "azurerm_resource_group" "test" {
  name     = "amtestRG-vidarw"
  location = "westeurope"
}

resource "azurerm_api_management" "test" {
  name            = "acctestAM-vidarw"
  publisher_name  = "pub1"
  publisher_email = "pub1@email.com"

  sku {
    name     = "Developer"
    capacity = 1
  }

  location            = "${azurerm_resource_group.test.location}"
  resource_group_name = "${azurerm_resource_group.test.name}"
}

data "azurerm_api_management" "test" {
  name                = "${azurerm_api_management.test.name}"
  resource_group_name = "${azurerm_api_management.test.resource_group_name}"
}

resource "local_file" "foo" {
  content = "${data.azurerm_api_management.test.public_ip_addresses.0}"
  filename = "${path.module}/output.txt"
}

[tombuildsstuff]

hey @vidarw

Thanks for this PR - on the generally looks pretty good to me, if we can fix up the minor issues this otherwise LGTM 👍

Thanks!

[tombuildsstuff]

Tests pass:

[ghost]

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